RCRA REVISION CHECKLIST 55

Statistical Methods for Evaluating Ground-Water Monitoring
Data from Hazardous Waste Facilities
53 FR 39720-39731
October 11, 1988
(Non-HSWA Cluster V)
	STATE ANALOG IS:
		     ANALOGOUS	  EQUIV-	   MORE	BROADER
   FEDERAL REQUIREMENT     | 	FEDERAL RCRA CITATION    |	   STATE CITATION	| ALENT  |	STRINGENT |	IN SCOPE	

PART 264 - STANDARDS FOR OWNERS AND OPERATORS OF HAZARDOUS WASTE
TREATMENT, STORAGE, AND DISPOSAL FACILITIES

SUBPART F - RELEASES FROM SOLID WASTE MANAGEMENT UNITS

REQUIRED PROGRAMS	 
definition of
"detected" as in
264.98(f)	264.91(a)(1)	
definition of
"exceeded" as in
264.99(d)	264.91(a)(2)	

GROUND-WATER PROTECTION STANDARD	 
replace "entering"
after 264.93 with
"detected in"; in
the last clause
replace everything
after "constituents
have" with "been
detected in the
ground water."	264.92	
remove "and" from
end of paragraph	264.97(a)(1)	
redesignate
264.97(g)(3) as
264.97(a)(1)(i);
sampling of wells
not hydraulically
upgradient	264.97(a)(1)(i)	
old 264.97(g)(3)(i)
becomes
264.97(a)(1)(i)(A);
insert "hydraulical-
ly" preceding "up-
gradient"; replace
"or" at end of
paragraph with "and"	264.97(a)(1)(i)(A)	
old 264.97(g)(3)(ii)
becomes
264.97(a)(1)(i)(B);
add "; and " to end	264.97(a)(1)(i)
of paragraph	(B)	
contamination detec-
tion when migration
to uppermost aquifer	264.97(a)(3)	
detection monitoring
--sampling procedure,
number and kinds of
samples, sample size	264.97(g)	
sequencing of at
least four samples;
requirements of
interval between	264.97(g)(1)	
alternate sampling
procedure	264.97(g)(2)	
redesignate as
264.97(a)(1)(i)	264.97(g)(3)	
specify statistical
evaluation methods
for ground-water data
and specify in
permit; requirements
for use of listed
methods:	264.97(h)	
parametric ANOVA
followed by multiple
comparisons
procedures	264.97(h)(1)	
ANOVA based on 
ranks followed by 
multiple comparisons
procedures	264.97(h)(2)	
tolerance or predic-
tion interval
procedure	264.97(h)(3)	
control chart
approach	264.97(h)(4)	
another statistical
method approved by
the Regional
Administrator	264.97(h)(5)	
performance
standards for
statistical methods
chosen under
264.97(h):	264.97(i)	
appropriate for dis-
tribution of chemical
parameters or hazard-
ous constituents;
transformed or dis-
tribution-free test	264.97(i)(1)	
individual well
comparison--0.01
Type I error;
multiple compari-
sons--0.05 Type I
error, but maintain
0.01 Type I error
for individual wells	264.97(i)(2)	
for control chart
approach, what must
be approved by Re-
gional Administrator	264.97(i)(3)	
for tolerance or
prediction interval,
what must be approved
by Regional
Administrator	264.97(i)(4)	
account for data
below detection 
limit and require-
ments	264.97(i)(5)	
procedures to
correct or control
for seasonal and
spatial variability	264.97(i)(6)	
maintenance of
ground-water
monitoring data in
facility operating
record; when data
must be reviewed	264.97(j)	

DETECTION MONITORING PROGRAM	 
ground-water monitor-
ing program for each
chemical parameter
and hazardous con-
stituent; record of
ground-water
analytical data	264.98(c)	
Regional Administra-
tor specifies fre-
quency of samples
and tests; four
samples per well
semi-annually	264.98(d)	
determine if
statistically sig-
nificant evidence
of contamination	264.98(f)	
methods which can
be used	264.98(f)(1)	
determine evidence of
contamination at each
monitoring well at
compliance point;
time period deter-
mined by Regional
Administrator	264.98(f)(2)	
what owner/operator
must do if sta-
tistically significant
evidence of
contamination	264.98(g)	
notification of
Regional
Administrator	264.98(g)(1)	
immediate determina-
tion if Appendix IX
constituents are
in ground water	264.98(g)(2)	
for constituents
found, resample in
one month; if con-
firmed, form basis
of compliance moni-
toring; no resample--
initial analysis
is basis	264.98(g)(3)	
application for
permit modification	264.98(g)(4)	
    1	Appendix IX
constituent
concentration	264.98(g)(4)(i)	
proposed changes to
ground-water	264.98(g)(4)
monitoring system	(ii)	
proposed additions	264.98(g)(4)
or changes	(iii)	
proposed concentra-
tion limit or notice
of intent for
alternate	264.98(g)(4)
concentration limit	(iv)	
what must be sub-
mitted within 180
days	264.98(g)(5)	
data to justify
alternate concen-
tration limit	264.98(g)(5)(i)	
engineering
feasibility plan for
corrective action	264.98(g)(5)(ii)	
concentration of
264.98(g)(2) con-
stituents does not
exceed values of	264.98(g)(5)(ii)
Table 1, 264.94	(A)	
alternate concen-	264.98(g)(5)(ii)
tration limit	(B)	
demonstration that 
a source other than
regulated unit caused
contamination	264.98(g)(6)	
notify Regional
Administrator of
intent to submit
demonstration	264.98(g)(6)(i)	
report demonstrating
that another source
caused contamination
or error in sampling,
analysis or
evaluation	264.98(g)(6)(ii)	
application for
permit modification	264.98(g)(6)(iii)	
continue to
monitor	264.98(g)(6)(iv)	
what must be done if
detection monitoring
program no longer
satisfies
requirements	264.98(h)	

delete paragraph	264.98(i)	

delete paragraph	264.98(j)	

delete paragraph	264.98(k)	

COMPLIANCE MONITORING PROGRAM	 
Regional Admin-
istrator specifies
procedures and
statistical methods	264.99(c)	
sampling program for
each chemical
parameter or hazard-
ous constituent	264.99(c)(1)	
records of ground-
water analytical
data	264.99(c)(2)	
statistical
evidence of
increased contam-
ination of any
chemical parameter
or hazardous
constituent	264.99(d)	
method(s) to deter-
mine statistically
significant
evidence of
increased
contamination	264.99(d)(1)	
within reasonable
time period, deter-
mine if statis-
tically significant
evidence of increased
contamination at
each monitoring well
at compliance point	264.99(d)(2)	
Regional Administrator
specification of 
sample and test
frequencies; four
samples per well
semi-annually	264.99(f)	
annual analysis at
each well's compli-
ance point for all
264, Appendix IX
constituents; pro-
cedures regarding new
constituents not
in permit	264.99(g)	
remove old 264.99(h)
and redesignate old
264.99(i) as
264.99(h); revise
new 264.99(h)--
change "(h)" to
"(d)"; replace "the
ground-water protec-
tion standard" with
"any concentration
limits under 264.94
are"; insert "or
she" after "he"	264.99(h)	
redesignate old
264.99(j) as
264.99(i); revise
new 264.99(i)--
change "(h)" to
"(d)"; replace
"protection
standard" with
"concentration limits
under this section
are"; insert "or
she" after "he";
revise rest of
paragraph after
"regulated unit
caused" retaining
clause "In making
demonstration..."	264.99(i)	
redesignate old
264.99(k) as
264.99(j)	264.99(j)	
redesignate as
264.99(j) so that
264.99(k) no
longer exists	264.99(k)	

remove paragraph	264.99(l)